// 字体的转换
@mixin font-dpr ($font-size) {
    font-size: $font-size;
  
    [data-dpr="2"] & {
      font-size: $font-size * 2;
    }
  
    [data-dpr="3"] & {
      font-size: $font-size * 3;
    }
  }
  
  // px转换为rem
  @function px2rem ($px, $base-font-size: 64px) {
    @if unitless($px) {
      @warn "Assuming #{$px} to be in pixels, attempting to convert it into pixels for you";
      @return px2rem($px * 1px);
    }
  
    @else if unit($px)==rem {
      @return $px;
    }
  
    @return ($px / $base-font-size) * 1rem;
  }
  